Popular Post enaon Posted January 13, 2022 Popular Post Share Posted January 13, 2022 (edited) I love the s18, for me it is years ahead, but I have come to a problem that is new to me, and dangerous, so I will report. facts: 1.The s18 has 3 battery packs, and 3 bms's. The third pack it cut at two smaller packages, the same for the bms, it is cut at half. 2. the motherborad monitors the bms's heath, the x90 plug has two extra pins that report a voltage according to conditions, if not within the expected range, the charging process does not start. 3. The motherboard needs the back pack (Both of the small back ones, as they are one pack) to be present and working to allow for a charge, if only the front ones are plugged in, the charging is not allowed. the bad case: I have a case here, where two things went wrong at the same time, and this can lead to a gotway (fire) situation. problem one: One of the front packs has a semi-broken cell, and reports voltage signal out of specs. This leads to the s18 starting the charging process even if the back packs are not connected. I do not know why, I verified it by connecting it to my unit too, just to rule out motherboard/version. problem two: the back packs bms is broken, it reports 0 at the health signal. the result of this: If the out of specs front battery is plugged in, the back packs take a charge too from the output interconnection, the back bms is off, so it cannot stop charging or balance the cells, it has become a gw bms, allways on. this leads to situation where although both back packs combined are at the same voltage level as the front one, they are way off from one another. The machine does not report an error. I am waiting for Samsung g50 cells to fix the front pack that makes all this mess possible, I will report back the findings, but overall I am bit worried. we NEED per cell voltage monitoring. Edited January 13, 2022 by enaon 2 3 Quote Link to comment Share on other sites More sharing options...
Funky Posted January 13, 2022 Share Posted January 13, 2022 (edited) 15 minutes ago, enaon said: we NEED per cell voltage monitoring. That's the thing, we NEED a lot of things.. Edited January 13, 2022 by Funky Quote Link to comment Share on other sites More sharing options...
supercurio Posted January 13, 2022 Share Posted January 13, 2022 (edited) 2 hours ago, enaon said: we NEED per cell voltage monitoring. Couldn't agree more here. Implementing cell-group monitoring will help to know what's going, on a user side of things via apps. It will allow to add a second layer of safety check. It will also encourage the firmware code handling this logic to work with full status instead of making super dumb assumptions based on partial data as you described here. Edited January 13, 2022 by supercurio 3 Quote Link to comment Share on other sites More sharing options...
duanew Posted January 18, 2022 Share Posted January 18, 2022 The onewheel has had the voltage of each cell group available in third party app for a very long time. It is too bad we can't get it in our EUCs. Quote Link to comment Share on other sites More sharing options...
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